She stayed in the car sitting up and kept looking over at our RV and when she saw me she would look back down. She was parked there looking suspicious the entire time. I just didn't feel comfortable because why did she have to park right in front of me way out at the far end of the parking lot all by ourselves.
It's possible she was mentally unwell?
Where I live the local park has this unsettling "tradition" of people driving there and just parking their vehicles (cars or pickup trucks) and
just sitting in them, even on nice days. It creeps me out. Get out, walk in the world, feel the breeze, smell the grass, see the river. Walk. Cars are for
moving, not sitting in (unless you are a police officer on a stakeout, I guess). If you want to sit in a vehicle, get an RV!

Well, after about two hours I finally decided to drive off and find another Walmart about thirty miles down the road where we found about five other RV's parked.
Although you were probably most comfortable around other RVs and advanced your trip 30 mi anyway, maybe next time consider moving your RV to another section of the same parking lot; if the woman
follows you there, then you know something weird is up.